feat(desktop): portal-based Linux global shortcuts and PTT (#3185)

fluxer_desktop/native/linux-portals/index.js

@@ -65,8 +65,7 @@ module.exports = {
 	saveFile: binding ? binding.saveFile : null,
 	requestBackground: binding ? binding.requestBackground : null,
 	GlobalShortcutsPortal: binding ? binding.GlobalShortcutsPortal : null,
-	isAvailable: binding ? binding.isAvailable : () => false,
-	getPortalVersion: binding ? binding.getPortalVersion : () => null,
+	SessionStateMonitor: binding ? binding.SessionStateMonitor : null,
 	readColorScheme: binding ? binding.readColorScheme : () => 'no-preference',
 	readContrast: binding ? binding.readContrast : () => 'no-preference',
 	readAccentColor: binding ? binding.readAccentColor : () => null,